{shapes={
  {2,0,7,14,3,10,texture="obsidian"},
  {2,3,7,5,13,10,texture="obsidian"},
  {11,3,7,14,13,10,texture="obsidian"},
  {2,13,7,14,16,10,texture="obsidian"},
  {5,3,8,11,13,9,texture="portal"}
}}